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Jsunpack-n Tutorial (Analyzing Malicious Documents)

Required Dependencies(all these dependencies are present in jsunpack-n package in a folder named depend):
1) Build and install pynids (nids) from ./depends/pynids-0.6.1.tar.gzTo compile pynids, you may need the following (ubuntu) packages:libpcap-dev pkg-config python-dev libgtk2.0-dev libnet1-dev
To install these package either use software center or command apt-get install PackageName

This package has modifications to the spidermonkey source code; therefore, it is not recommended you use default smjs packages. (Details of the modifications are in INSTALL.spidermonkey.shellcode and INSTALL.spidermonkey, for historical purposes)

Optional:
a) To use the -g --graph option, you should install the "python-yapgvb" package.

b) Filetype identification: Magic (optional)
If you use Ubuntu, you can install the python-magic package using apt-get install python-magic.
To define your local magic data use file /etc/magic.

Using Jsunpack-n
Now unzip the samples.tgz,it contain many document on which you can test jsunpack1:Run following command to find file type first as in sample folder file extension are renamed:
$file NameofFile
$./jsunpackn.py -V /home/alt/Desktop/Analyze-Mal-doc/jsunpack-n/jsunpack-n/samples/pdf.file

Jsunpack-n

2:Read the decoded file which is extracted in last step.$cat ./temp/files/original_c34022681fa89171fc803baeb2b120400bc1775f

Jsunpack decoded file

3:jsunpack-n also contain pdf.py tools that can be used to decompress javascripts.
$ ./pdf.py -V /home/alt/Desktop/Analyze-Mal-doc/jsunpack-n/jsunpack-n/samples/pdf-thisCreator.file
Above command will otput javascript in a ".out" file
$cat samples/pdf-thisCreator.file.out

pdf.py tool in jsunpack-n

4:Produce a graph using -g option,give name of a picture file with proper extension like uname.png with -g option ex: -g nameofpicfile.png
$./jsunpackn.py -g unamed.png /home/alt/Desktop/Analyze-Mal-doc/jsunpack-n/jsunpack-n/samples/pdf.file

Jsunpack graph

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Steps
1:download the page.
2:open fc4.js in your favourite editor and add following lines in it or just replace it with vode given below.
3:then open the download html file in browser and fill the form with your email and a garbage value string.
4:thats it? it will show you the real security string??
yeah but ...theirs another challenge waiting for you ... :D

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